[issue12583] More detailed ImportError messages

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

For the ImportWarning docs, there could stand to be more; patches welcome. =)

As for ImportError being postmortem on an error, that is not always true as plenty of people use the trick, e.g.:

try: import json
except ImportError: import simplejson as json

As for detecting circular imports, flagging it somehow might work, but directly analyzing the stack won't do since that is extremely costly on some VMs.

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